All verbs in the "to" form end in the letter r, and it is always one of three endings. You already have an example of each.
-ar · -er · -ir
The -ar group is huge because it is the one these convertible verbs are built from.
respiración → respirar, literally "to respire", which is how you say to breathe.
At school we learn verbs are "doing words", which is really unhelpful. Is is a verb, but if you say he is here, what is he doing? Nothing.
To get the "I" version, take off the -ar, -er or -ir and put -o. But something else happens too: the accent moves.
intentar → intento (accent on the penultimate syllable)
This is extremely important. Intentar has the accent on the end, but intento has it on the second-to-last syllable. If you say intentó, with the accent on the end, it means he tried, which becomes useful later when you learn the past.
Intentar itself is not present tense. It has no tense at all: it is the "to" form. Part of what makes the present tense is moving that accent.
No dono · Voy a comer · The z in organizo is pronounced /th/ in Spain: /organitho/.
If something in the sentence already shows you are talking about the future, you can just use the present. It sounds odd in English but it is absolutely perfect Spanish to say I eat tomorrow.
Como con Pablo mañana · Voy a comer con Pablo mañana · Vengo mañana (I am coming tomorrow, no word for "will" needed)
Voy a tenerlo tarde · Voy a tenerlo más tarde · Entre tú y yo (between you and I)
Another hook for saber: Homo sapiens, the wise creature.
Tener is to have, but it also translates as -tain wherever that sits inside an English verb.
By the rule, I have should be "teno". It is tengo: irregular, with a g popping up. The good news is that irregular verbs group together, and venir behaves the same way.